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x in (-oo:+oo)
(x/(15/4))*x = 16/9 // - 16/9
(x/(15/4))*x-(16/9) = 0
(x/(15/4))*x-16/9 = 0
4/15*x^2 = 16/9 // : 4/15
x^2 = 20/3
x^2 = 20/3 // ^ 1/2
abs(x) = (20/3)^(1/2)
x = (20/3)^(1/2) or x = -(20/3)^(1/2)
x in { (20/3)^(1/2), -(20/3)^(1/2) }
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